---
id: CVE-2025-62711
title: Wasmtime is a runtime for WebAssembly
summary: >-
  Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before
  38.0.3, the implementation of component-model related host-to-wasm trampolines
  in Wasmtime contained a bug where it's possible to carefully craft a
  component, which…
severity: low
cvss: 3.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-755
vendor: bytecodealliance
product: wasmtime
affected:
  - 'wasmtime >= 38.0.0, < 38.0.3'
patched:
  - wasmtime 38.0.3
published: '2025-10-24'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T11:10:00.250'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-62711'
references:
  - url: >-
      https://github.com/bytecodealliance/wasmtime/commit/192f2fcdadfec9d0cf6b58548a85a7307450cbf5
    label: security-advisories@github.com
  - url: 'https://github.com/bytecodealliance/wasmtime/pull/11592'
    label: security-advisories@github.com
  - url: >-
      https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-4h67-722j-5pmc
    label: security-advisories@github.com
  - url: 'https://crates.io/crates/wasmtime'
  - url: 'https://rustsec.org/advisories/RUSTSEC-2025-0112.html'
tags:
  - nvd
  - osv
  - rust
epss: 0.0041
epssPercentile: 0.35067
ingestedAt: '2026-10-01T18:55:42.300Z'
aliases:
  - RUSTSEC-2025-0112
  - GHSA-4h67-722j-5pmc
ecosystem: rust
---

## Overview

Wasmtime is a runtime for WebAssembly. In versions from 38.0.0 to before 38.0.3, the implementation of component-model related host-to-wasm trampolines in Wasmtime contained a bug where it's possible to carefully craft a component, which when called in a specific way, would crash the host with a segfault or assert failure. Wasmtime 38.0.3 has been released and is patched to fix this issue. There are no workarounds.

## Affected

- `wasmtime >= 38.0.0, < 38.0.3`

## Remediation

Upgrade past the affected range:

- `wasmtime 38.0.3`

## Package advisory (CVE-2025-62711)

Affected packages:

- `wasmtime >= 38.0.0, < 38.0.3`

Patched in:

- `wasmtime 38.0.3`

Source: https://osv.dev/vulnerability/RUSTSEC-2025-0112